Topic
Benzopyrans
About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.
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TL;DR: 3,4-Dihydro-2, 4-dimethoxy-2-methyl-2H-1-benzopyrans are formed in high yields by the cyclocondensation of o-hydroxybenzaldehydes with 2,2-dimethylpropane catalysed by elemental iodine at room temperature as mentioned in this paper.
Abstract: 3,4-Dihydro-2,4-dimethoxy-2-methyl-2H-1-benzopyrans are formed in high yields by the cyclocondensation of o-hydroxybenzaldehydes with 2,2-dimethoxypropane catalysed by elemental iodine at room temperature.
25 citations
TL;DR: In this article, 2,2-Dimethoxypropane reacts with a variety of o-hydroxybenzaldimines in the presence of a catalytic amount of scandium triflate at ambient temperature to afford a series of new compounds, 3,4-dihydro-4-amino-2-methoxy-2,methyl-2H-1-benzopyrans, in high yields, with good diastereoselectivity.
24 citations
TL;DR: Glycals react smoothly with o-hydroxybenzaldehydes and trimethyl orthoformate in the presence of a catalytic amount of scandium triflate under mild reaction conditions to afford the corresponding cis-annelated pyranobenzopyrans in good yields with high diastereoselectivity.
24 citations
TL;DR: Salicylaldehydes react with 5-methyl-4-hexen-1-ol (4a) or 6methyl-5-hepten-2-ol(4b) in benzene in the presence of trimethyl orthoformate and a catalytic amount of p-toluenesulfonic acid at rt to give angularly-fused trans-5,5-dimethyl-3,4,4a,10b-tetrahydro-2H,5H-pyrano[3,2
Abstract: Salicylaldehydes reacted with 5-methyl-4-hexen-1-ol (4a) or 6-methyl-5-hepten-2-ol (4b) in benzene in the presence of trimethyl orthoformate and a catalytic amount of p-toluenesulfonic acid at rt to give angularly-fused trans-5,5-dimethyl-3,4,4a,10b-tetrahydro-2H,5H-pyrano[3,2-c][1]benzopyrans (6) in high yields with complete stereoselectivity.
24 citations
Patent•
20 Dec 1999
TL;DR: The present invention relates to benzopyrans and benzoxepines of formula (I), wherein X, A, R1, R2 and p have the meanings as given in claim 1, which can be used in the treatment of dislipidaemias, atherosclerosis and diabetes, to pharmaceutical compositions comprising them and to processes allowing the preparation of these compounds as discussed by the authors.
Abstract: The present invention relates to benzopyrans and benzoxepines of formula (I), wherein X, A, R1, R2 and (R)p have the meanings as given in claim 1, which can be used in the treatment of dislipidaemias, atherosclerosis and diabetes, to pharmaceutical compositions comprising them and to processes allowing the preparation of these compounds.
24 citations